San Antonio Weather in September

During September, San Antonio experiences moderate daytime temperatures of 18°C (64°F) and cooler nights around 8°C (46°F). Some rainfall is typical during this period.

Rainfall in San Antonio in September

Rain is expected on roughly 4 days, totalling around 25 mm (1 in) for the month. The rain this month typically falls in concentrated bursts rather than all-day showers. Expect a few heavier spells rather than constant grey skies.

Temperature in San Antonio in September

September is a excellent month in San Antonio, with 18°C (64°F) during the day and 8°C (46°F) at night. A light jacket or extra layer can be useful, especially outside the warmest hours of the day. At 8°C (46°F) overnight, it gets properly cold after dark. On the bright side, cold nights tend to make for excellent sleeping conditions.

Wind Speed in San Antonio in September

Wind speeds average 4 m/s (8 knots) during September. At this speed, expect moderate winds that can raise dust and move small branches. Since this is an average, some days have gentle light winds while others experience stronger breezes that are quite noticeable.

Average water temperature in September

With water temperatures around 10°C (50°F), swimming isn't really an option for most visitors. The cold sets in quickly and a wetsuit won't fully solve it.

If your ideal day consists of dry skies and pleasant temperatures, January, February, March, April, September, October, November and December typically offer the best circumstances for San Antonio.